MAX11359A_12 Datasheet, PDF(39/67 Page) Maxim Integrated Products – 16-Bit Data-Acquisition System with ADC, DAC, UPIOs, RTC, Voltage Monitors, and Temp Sensor

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MAX11359A_12 Datasheet, PDF (39/67 Pages) Maxim Integrated Products – 16-Bit Data-Acquisition System with ADC, DAC, UPIOs, RTC, Voltage Monitors, and Temp Sensor

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MAX11359A

16-Bit Data-Acquisition System with ADC, DAC,

UPIOs, RTC, Voltage Monitors, and Temp Sensor

DACA_OP Register (Power-On State: 000X XX00 0000 0000)

MSB

DAE

DBE

OP1E

DACA7

DACA6

DACA5

DACA4

DACA3

DACA2

DACA9

DACA1

DACA8

LSB

DACA0

DACA_OP Register

Writing to the DACA_OP output register updates DACA

on the rising SCLK edge of the LSB data bit. The output

voltage can be calculated as follows:

VOUTA = VREF x N/210

where:

VREF is the reference voltage for the DAC.

N is the integer value of the DACA<9:0> output regis-

ter. The output buffer is in unity gain.

The DACA data is 10 bits long and right justified.

DAE: DACA enable bit. Set DAE = 1 to power up the

DACA and the DACA output buffer in the MAX11359A.

OP2E: OP2 power-enable bit. Set OP2E = 1 to power

up OP2 in the MAX11359A.

OP1E: OP1 power-enable bit. Set OP1E = 1 to power

up OP1 in the MAX11359A. This bit is mirrored in the

DACB_OP register.

DACA<9:0>: DACA data bits.

REF_SDC Register (Power-On State: 0000 0000)

MSB

REFV1

REFV0

AOFF

AON

SDCE

TSEL2

TSEL1

LSB

TSEL0

The REF_SDC register contains bits to control the refer-

ence voltage and signal-detect comparator.

REFV<1:0>: Reference buffer voltage gain and enable

bits. Enables the output buffer, sets the gain and the

voltage at the REF pin as shown in Table 10. Power-on

state is off to enable an external reference to drive the

REF pin without contention.

AOFF: ADC and DAC/op-amp power-off bit. This bit pro-

vides a method for turning off several analog functions

with a single write. Setting AOFF = 1 deasserts the

ADCE in the ADC register and DAE/OP3E, OP2E, and

OP1E bits in the DACA_OP registers, powering down

these analog blocks. Setting AOFF = 0 has no effect.

The AON bit has priority when both AON and AOFF bits

are asserted.

Most of the analog functions can be disabled with a

single write to the REF_SDC register by using AOFF,

REFV<1:0>, and SDCE.

Table 10. Setting the Reference Output

Voltage

REFERENCE

BUFFER GAIN

(V/V)

REF OUTPUT

VOLTAGE (V)

REFV1

REFV0

Off (High

Disabled

Impedance

at REF)

1.0

1.638

2.0

1.251

1.996

2.422

Maxim Integrated

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